/usr/lib64/mpich/bin/mpicc
/usr/lib64/mpich/bin/mpic++
/usr/lib64/mpich/bin/mpicxx
/usr/lib64/mpich/bin/mpif77
/usr/lib64/mpich/bin/mpif90
/usr/lib/mpich/bin/mpicc
/usr/lib/mpich/bin/mpic++
/usr/lib/mpich/bin/mpicxx
/usr/lib/mpich/bin/mpif77
/usr/lib/mpich/bin/mpif90
You may install this package on CentOS with
yum
install mpich-devel